. >> in union city the school district will have the first active school drill next march and they are keenly aware. >> with younger children, it's like a fire drill maneuver where you are reassuring the children and moving them around. >> they were coaching faculty members of how to spot signs of distress in kids. >> let them know, these things do happen. it rarely happens and there are adults they can go to when they are feeling afraid. >> in san francisco it was just gut check time. school officials were reexamining safety plans since columbine. since then, police say their tactics have changed. >> we take immediate action. we know that lives are at stake. if there is an immediate pro problem, our officers are told to gather and engage. >> this morning, president obama is using his weekly address to ask all americans to keep the victims of violence in mind. >> as a nation, we have endured far too many of these tragedies in the last few years. an elementary school in newtown, a shopping mall in oregon, a house of worship in wisconsin, a movie theater in colorado, countless street cor